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Redeemable Convertible Preferred Stock - Additional Information (Detail) (USD $) | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Equity [Abstract] |  |
Accretion amount | $ 33 | $ 31

X
- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of accretion of the preferred stock redemption discount during the period. + References No definition available. + Details
Name: | us-gaap_PreferredStockAccretionOfRedemptionDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration